The photoelectrons emitted from a given...

The photoelectrons emitted from a given cathode , on the incidence of a given monochromatic beam of light have

an energy spread with a lower limit

an energy spread with an upper limit

an energy with no sharp limit

a definite energy only

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Photoelectrons emitted from a metal have

A monochromatic light soure of frequency f illuminates a metallic surface and ejects photoelectrons. The photoelectrons having maximum energy are just able to ionize the hydrogen atoms in ground state. When the whole experiment is repeated with an incident radiation of frequency (5)/(6) f , the photoelectrons so emitted are able to excite the hydrogen atom beam which then emits a radiation of wavelength 1215 Å . (a) What is the frequency of radiation? (b) Find the work- function of the metal.

A source of light is said to be monochromatic if it will emit light waves of

Assertion: A photosensitive surface is illuminated by a monochromatic light of wavelength lambda and intensity I. The number of photoelectrons emitted per second is doubled when the intensity of light is doubled. However, the maximum speed of emitted electrons remains unchanged. Reason: The number of electrons emitted per second is directly proportional to the intensity of the incident light. The kinetic energy of the emitted photoelectrons is independent of the intensity of the light.

The maximum velocity of the photoelectrons emitted from the surface is v when light of frequency n falls on a metal surface. If the incident frequency is increased to 3n, the maximum velocity of the ejected photoelectrons will be

The kinetic energy of photoelectrons emitted by a photosensitive surface depends on the internsity of the incident radiation

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 20-PAPER 1 (Physics & Chemistry)

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